Automatic upgrade

Dockerfile

@@ -11,9 +11,14 @@ FROM postgis/postgis:16-master
 
 COPY --from=builder /usr/local/src/pg_autoconfig/bin/pg_autoconfig /
 
+COPY upgrade-entrypoint.sh /
+
 RUN localedef -i cs_CZ -c -f UTF-8 -A /usr/share/locale/locale.alias cz_CZ.UTF-8 && \
-	apt-get update && apt-get install -y postgresql-16-auto-failover pg-auto-failover-cli postgresql-16-pgvector && rm -rf /var/lib/apt/lists/*
+	apt-get update && apt-get install -y postgresql-16-auto-failover pg-auto-failover-cli postgresql-16-pgvector && \
+	rm -rf /var/lib/apt/lists/* && \
+	chmod +x /upgrade-entrypoint.sh
 
 #ENV LANG en_GB.utf8
 
-ENTRYPOINT [ "/pg_autoconfig" ]
+ENTRYPOINT [ "/upgrade-entrypoint.sh" ]
+CMD [ "/pg_autoconfig" ]

upgrade-entrypoint.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+set -e
+
+DATA_DIR="/var/lib/postgresql/data"
+OLD_VERSION_FILE="$DATA_DIR/PG_VERSION"
+NEW_VERSION="16"
+
+if [ -f "$OLD_VERSION_FILE" ]; then
+    OLD_VERSION=$(cat "$OLD_VERSION_FILE")
+
+    if [ "$OLD_VERSION" != "$NEW_VERSION" ]; then
+        echo "Data version ($OLD_VERSION) differs from engine ($NEW_VERSION). Starting upgrade..."
+        
+        # 1. Move old data to a temporary folder
+        mkdir -p $DATA_DIR/old_data
+        mv $DATA_DIR/* $DATA_DIR/old_data/ || true
+        
+        # 2. Initialize new data directory
+				mkdir $DATA_DIR/new_data
+        initdb -D $DATA_DIR/new_data
+        
+        # 3. Run pg_upgrade
+        # --link is used to avoid copying files (fast, but requires a backup!)
+        pg_upgrade \
+            -d $DATA_DIR/old_data \
+            -D $DATA_DIR/new_data \
+            -b /usr/bin/postgres-16 \
+            -B /usr/local/bin \
+            --link
+            
+        echo "Upgrade complete. Cleaning up..."
+        rm -rf $DATA_DIR/old_data
+				mv $DATA_DIR/new_data/* $DATA_DIR/
+				rmdir $DATA_DIR/new_data
+    fi
+fi
+
+exec $@